ATSHA204A-MAHCZ-S

Specialized ICS Overview

The ATSHA204A-MAHCZ-S is a Microchip CryptoAuthentication security IC in an 8-lead UDFN (2x3 mm) package. It provides hardware-based key storage and symmetric authentication using the SHA-256 algorithm with MAC/HMAC options. The device features a 72-bit unique serial number, an internal RNG, and 4.5 KB of EEPROM for keys and data alongside 512 bits of OTP memory. It supports I2C (up to 1 MHz) and Single-Wire interfaces, operates on a 2.0V to 5.5V supply, and draws less than 150 nA in sleep mode.

Specialized ICS Feature Summary

• Integrated SHA-256 engine supporting MAC and HMAC protocols
• Protected storage for up to 16 keys within 4.5 KB EEPROM
• Guaranteed unique 72-bit serial number and high-quality RNG
• Dual interface support: 1 MHz I2C and UART-compatible Single-Wire

Specialized ICS Applications

• Secure download and boot validation
• Ecosystem control for consumables and accessories
• Anti-cloning protection for hardware components
• Message security and session key exchange

Specialized ICS Procurement Notes

Verify the ordering suffix 'S' corresponds to the Reel packaging format as specified in the product parameters. Confirm the 8-UDFN (2x3) package dimensions match the design footprint. Ensure the host system supports the required 2.0V to 5.5V supply range and compatible I2C or Single-Wire signaling levels before integration.

Specialized ICS Selection Notes

Select this component when a compact surface-mount solution is required for symmetric authentication. The 8-UDFN package offers a small footprint suitable for space-constrained designs. Choose between I2C and Single-Wire interfaces based on available GPIO resources; Single-Wire reduces pin count but requires specific bus management for multiple devices.

Specialized ICS Part Context

This part belongs to the ATSHA204A series within the Microchip CryptoAuthentication™ family. It serves as a hardware security module for authenticating devices and protecting firmware. The MAHCZ-S designation identifies the specific manufacturer code, package type, and reel packaging configuration.

Specialized ICS Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source material. While other chips may offer similar functionality, software compatibility and command set differences must be evaluated carefully if considering alternatives.